Oct.5 (GMM) Lotus' double-DRS style 'device' is still not ready to make its grand prix debut.

The top speed-boosting concept has been tested extensively in practice sessions recently, but so far the black and gold-coloured team has decided to take it off the car prior to the decisive qualifying sessions and grands prix.

Team boss Eric Boullier, however, insisted recently that the 'device' will be ready to race at Suzuka.

It was indeed tested again on Friday, but Lotus said in a statement: "We were not able to get 'the device' functioning at a sufficient level for it to be used over the rest of the weekend."